FS#797 - QCAD hanging after loading working file

I have the german Version of QCAD 3.0.0.After starting QCAD I load my current work file (an architecture one).After loading I get two working Areas in QCAD and after a while the complete Software QCAD (only QCAD) is hanging. It is not possible to close the QCAD SW with the task Manager of Windows 7. Only to log out helps to Close or remove the running SW. The attachment Shows a Screen copy. The view is when you see through milky glasses to QCAD.

I bought this SW a few days ago and then this happened. I have spend a lot of time to generate my Project and now this.

Is there any one who knows what the Problem is?Is that a Problem of thw QCAD SW or can be the problem my current work file (generated with QCAD on my Notebook). Note, Problem happens on my work Station. I have started to work on my Notebook, but i found out that the Screen is to small to work with QCAD. So i moved the SW to my work Station. (Both working with Windows 7) This to get more Details abou the handling and whathappens before.

Would be great to get a quick Response or better a working solution for my Problem. When you need more details please let me know.